THE ROLE OF WATER AND TEMPERATURE IN THE ELECTROCHEMICAL-BEHAVIOR OF SOLID IRON(III) HEXACYANOFERRATE(II III)/

The influence of temperature over the range from -30 to 25-degrees-C o n the electrochemical properties of solid iron(III) hexacyanoferate(II /III) containing various amounts of water has been studied by means of cyclic voltammetry and impedance spectroscopy. The system studied is a water-insoluble mixed-valence coordination compound. The experiments have shown in major role for water molecules in the charge transport across this solid system. An attempt has been made to understand the e xperimental data on the basis of an existing model of redox conductanc e in solid mixed-valence transition metal hexacyanoferrates. The activ ation energy of charge migration in a partially dehydrated system and the activation energy of charge diffusion in a well-hydrated system ha ve been determined.